Does it worry you when Ned and Charlotte get too close? Because if he accidently touches her she'll go back to being dead.

Not if he uses something to touch her

It distracted me a lot at first when they were standing close to each other or riding in the car together, but apparently it has to be skin-on-skin contact to be fatal. Still, sometimes it seems as though they really aren't being as careful, or even aware, as they should be.

Exactly, they get so close that it wouldn't take much for them to accidently touch. And that would be a disaster for Charlotte (Chuck).